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Bump third_party/pigweed/repo from `c8c31a0` to `892cd9a` #515

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Run time

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Job	Run time
Chef - ESP32 CI Examples	4m 28s
Chef - Linux CI Examples	4m 8s
Chef - NRFConnect CI Examples	27m 16s
Chef - Telink CI Examples	7m 29s
	43m 21s